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organic farming

(Encyclopedia)organic farming, the practice of growing plants—especially for fruits and vegetables, but for ornamentals as well—without the use of synthetic pesticides, herbicides, and fertilizers, or of raisin...

DeGeneres, Ellen Lee

(Encyclopedia) DeGeneres, Ellen Lee, 1958- , American actor and talk-show host, b. Metairie, La. DeGeneres’s parents split in 1974, and she subsequently ...

Henry, Joseph

(Encyclopedia)Henry, Joseph, 1797–1878, American physicist, b. Albany, N.Y., educated at Albany Academy. He taught (1826–32) mathematics and natural philosophy at Albany Academy and was professor of natural phi...

Cruz, Ted

(Encyclopedia) Cruz, Ted (Raphael Edward), 1970- , American politician, b. Calgary, Alberta, Canada (Princeton Univ. (B.A., 1992), Harvard Law School (J.D., 1995). B...

microphone

(Encyclopedia)microphone, device for converting sound into electrical energy, used in radio broadcasting, recording, and sound amplifying systems. Its basic component is a diaphragm that responds to the pressure or...

Kennedy, Anthony McLeod

(Encyclopedia)Kennedy, Anthony McLeod, 1936–, associate justice of the U.S. Supreme Court (1988–2018), b. Sacramento, Calif., grad. Stanford (1958), Harvard Law School (1961). For many years (1965–88) he taug...

robotics

(Encyclopedia)robotics, science and technology of general purpose, programmable machine systems. Contrary to the popular fiction image of robots as ambulatory machines of human appearance capable of performing almo...

Thurmond, Strom

(Encyclopedia)Thurmond, Strom (James Strom Thurmond) thûrˈmənd [key], 1902–2003, U.S. senator from South Carolina (1954–2003), b. Edgefield, S.C. He read law while teaching school (1923–29) and was admitte...

Thomas, Clarence

(Encyclopedia)Thomas, Clarence, 1948–, associate justice of the U.S. Supreme Court (1991–), b. Pin Point (Savannah), Ga. Raised in a poor family, he graduated (1974) from the Yale Law School and became a promin...

solar cell

(Encyclopedia)solar cell, semiconductor devised to convert light to electric current. It is a specially constructed diode, usually made of forms of crystalline silicon or of thin films (as of copper indium gallium ...